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A. H. DE VOE. HANGER ADJUSTING MEANS FQR POWER TRANSMITTERS.

APPLICATION FILED OCT-30. l9l8- Patented Sept. 2, 1919.

2 SHEETS-SHEET I.

INVENTOR A RNEY \NB COLUMBIA PLANOGRAPII cm. WAIIHNG ION, D. c.

Patented Sept. 2, 1919.

2 SHEETSSHEET 2- INVENTOIRI A. H. DE VOE. HANGER ADJUSTING MEANS FORPOWER TRANSMITTERS. APPLICATION FILED OCT. 30. I918.

THB CGLUIIIIA PLANOGIAPN 0-, WASHINGTON, D- C.

- M W a H W j Z (6 W a 1 M M M P n z N 4 I :1 a z 1 1 a i 1 j j w 4% aUNITED STATES PATEN T OFFICE ALBERT H. DE VOE, 0F WESTFIELD, NEW JERSEY,ASSIGNOR T0 THESINGER MANU- FACTURING COMPANY, A CORPORATION OF NEWJERSEY.

HANGER-ADJ USTIN G MEANS FOR POWER-TRANSMITTERS.

Specification of Letters Patent.

1918. Serial No. 260,252.

To all whom it may concern Be it known that I, ALBERT H. DE Von, acitizen of the United States, residin at Westfield, in the county ofUnion and tate of New Jersey, have invented certain new and usefulImprovements in Hanger-Adjusting Means for Powar-Transmitters, of whichthe following is a specification, reference being had therein to theaccompanying drawings.

This invention relates to a means for adjusting the pulley-hanger of apower-transmitter, such as that shown in my eopending application SerialNo. 225,935, filed April 1, 1918, of which this application is adivision.

The present invention has for an object to provide means for practicallyinstantaneously varying the driving tension of the belt of a sewingmachine by adjustment of its driving pulley hanger. Another object is toprovide such a means which will remain in adjusted position, withoutrequiring any securing means, but which if desired can be fixedly held.A further object is to provide a release for the belt when not in usewhich has an invariable movement irrespective of the belt-tensioningmovement. A still further object is to provide a single actuating meansfor varying the driving tension of the belt and for releasing the beltwhen not in use.

In the accompanying drawings, Figure 1 is a leftside elevation of apower-transmitter. Fig. 2 is a rightside elevation of the same. Fig. 3is a front view of the transmitter, partly in section. Fig. 4 is abottom plan view with the pulleys removed and one arm of the transmitterframe broken away.

Referring to the drawings, 1 represents a table-top or other suitablesupport to which is secured the bracket 2 formed at one side with a lug3 in which is fixed a horizontal rod or pin 4. Slidably mounted in theapertured lugs 5, 5 at the other side of the frame 2 is a cylindricalrod 6 which is parallel to the rod 4 and is formed between its ends witha screw-thread 7. r

The transmitter-hanger or frame is in the form of a yoke 8 includingdepending arms 9 and 10 of channel formation. The yoke 8 is formed withan apertured boss 11 surrounding the threaded portion of the sliderod 6and with a laterally projecting lug 12 formed with a channel-way 13embracing the supporting rod 4. By virtue of this construction the yoke8 may be shifted bodily relatively to the bracket 2 rods 1 and 6.

Projecting through the wall of the boss 11 into engagement with thescrew-thread 7 is the inner end of a follower-screw 14, threaded intothe boss 11 and accessible through the aperture 15, Fig. 2, in the yoke8. Pi voted within the bifurcated extremity of the slide-rod upon thescrew-pin 1G is a cam-lever 17 adapted to be used as a handle to turnthe slide-rod 6 and effect a relative adjustment between said slide-rodand the yoke 8. The cam-lever 17 is flattened at 18' in the higherportion of its operative edge 18 for a purpose to be described.

The driving pulley 19 of the transmitter, which is connected by means ofa belt 20 with the usual constantly running line-shaft, not shown, isformed with a tubular hub 21 which is journaled externally of a tubularstud-pin 22 free at one end. and at its opposite end fixed within thebushing 23 which is secured within the apertured lower extremity of theyoke-arm 9. The hub 21 of the constantly running driving pulley isconfined to turn in a fixed operative position axially of the stud-pin22 by means of the collar 21 and the ball-thrust bearing 25, as shown inFig. The driving pulley is formed with an annular friction drivingsurface 26. The ball-thrust bearing comprises two spaced rings 25 havingthrust-sustaining surfaces disposed in parallel planes transversely ofthe axis of the stud 22 and a series of balls between said surfaces.

Mounted in spaced relation with the driving pulley 19 is a friction ringor brake disk 27 having a peripheral groove 28 within which is secured aleather friction ring 29 of large diameter; the disk 27 being formedwith a hub 30 which is fixed within the apertured lower extremity of theyoke-arm 10.

The driven pulley 31, which in practice is belted to the machine to bedriven, is fixed to a stub-shaft 32 journaled internally of the tubularstud 22 and carries a leather friction ring 33 complementary to thedriving surface 26. The driven pulley 31 is also formed with a frictionsiiu'face 31. complementary to the similar surface on the brake-ring 29.Disposed in end-to-end relation with the stub-shaft 32 are the push-pins35, 35 which serve to shift the driven pulley into engageg erlt witheither the driving pulley or brakealong the parallel Patented Sept. 2,1919. Original application filed April 1, 1918, Serial No. 225,935.Divided and. this application filed October 30,

In transmitters of the present type it is customary to providetreadle-controlled mechanism for establishing an interrupted drivingrelation between the driving and driven pulleys. In the presentinstance, the treadle mechanism is of an improved form and comprises arock-shaft 36 journaled in the bearing lugs 12 and 37 on the hangerframe.8 and supporting the downwardly extending arms 38, 88 formed at theirlower extremities with'cam-surfaces 39, 39' which are substantiallyparallel with each other but are inclined to the axial line of thestubshatt 82as shown in @Figs. 3 and 4.

Formed integrally with the cam arm 38 is a treadle-ar'm 40'having anapertured end 41 'inwhich is secured the usual treadle rod leading to atreadleplate (not shown). A downward pull upon the treadle arm 40.will'rock the shaft 36 and cause the camfacedarm 38 to shift thepushepin 354 inwardly, thus pressing the driven pulley forcibly againstthe driving pulley and etfecting the quick starting of the machine towhich the transmitter is belted] l/Vhen the pressure] upon the treadleis relieved, the rock-shaft 86 is turned in the opposite direc tionthrough the action of the coil-spring 42 surrounding the threaded rod43,- the bent inner end 43 of which enters'an aperture 44 in thecam-faced arm 38. The spring 42reacts against the'adjusting wing-nut 45on the rod 43 andthe ear 46 on the yoke 8, thus effecting a shifting ofthe driven pulley awayfrom the driving pulley and into engagement withthe brake-disk which, being of large diameter, quickly brings the drivenpulleytorest without shock. The wing-nut 45, being readily accessible tothe operator afiords a convenient means for securing either a light orheavytreadle action as desired." This adjustment can be made with easeby any ordinary sewing machine operator, whereas with many priortransmitters it has been necessary for the operator-to call in theservices of a special machinist to effect the desired adjustment. Itwill of course be readily understood that theoperator may effect thestopping of the machine inclependently of the action of the spring 42 bypressing downwardly upon the forward edge of the treadle-plate, thusthrusting the treadle-rod: upwardly and forcibly lifting the treadle-arm40 of the transmitter.

A dress-guard 47 is .pivoted to the ear 48 on the yoke" 8 and maybeswung upwardly to afford access to the driving and driven pulleys. Theleaf-spring 49 secured to the guard 47 and bearing against thepointedportion50 ofthe car 48 serves toyieldingly detain the guard 47 inlowered or' raised position.

Theoiling system comprises an oil well 51 in the extremity of thehanger-arm' 9' fully supplied with lubricant'which passes in series frombearing to bearing without attention "from the operator.

It will be observed that v may be swung from full to dotted lineposition, Fig. 2, to quickly loosen the belt 20 when the machine is notto be used for. a time. VVhen' operations are to be resumed the camleveris restored to full line positi on, thus restoring the original degreeof belt-tension previously determined by the adjustment of the yoke 8 onthe rod 6. The

set sjcrew 14 may, of course,

this simple arrangement the various bear ngs of the device are plentythe cam-lever 17 q be set up to lock v the slide-rod 6 and yoke 8intheir adjusted positions relative to'each other.

It will also be seen that movement of the cam-lever 117 on its pivotcauses'a fiXed'or variable shifting movement of the rod 6 and itssupported hanger 8 with respect to'the' supporting bracket 2, that is,from beltloo'sening "position to belt-tightening position or vice versa.On the other hand, a rotary movement of lever 17 on its longitudinalaxis causes a corresponding rotary movement of rod 6, which efiects avariable adjustment of rod 6 with respect to the hanger and of thelatter with respect to the bracket, by means of the screw threadconnection 7, 14. The position of the lever 17 willfot course vary withthe rotary movement given to rod 6.

The quick loosening and tightening ofthe belt without affecting theadjustment determining the degreeof tension on the belt when tightened,is' of great practical importance' in a device of the presentcharac'ter, as it is well known that the life of leather belting may be]materially lengthened by relieving it of tension when not in use. Then,for any reason, the machine is to remain idle for a time, a quick throwof the cam-lever 17 relieves the tension on the driving belt and alsorelieves the bearing pressure between'the driving pulley 19 and thel'supporting tubular stud. ,By restoring thefcam-lever to beljttighteningposition the flattened portion 18, of its operative cam edge 18 receivesthe thrust caused by the belt tension 'and'holds the cam-lever 17against accidental displacement. The degree'of belt tension determinedby the ad justment 7 14, is thus instantly restored.

Having thus set forth the nature of the invention, what I claim hereinis 1. In a power-transmitter, the combination with a supporting bracket,of a hanger, a pulley supported in said hanger, means for finelyadjusting the working position of said hanger relatively to said bracketand for securing the hanger in adjusted position, and means operativewithout disturbing said fine adjustment to instantaneously effect arelatively large belt-tightening or loosening shift of said hangerrelative to said supporting bracket, whereby the tension on the drivingbelt may be quickly relieved when the machine is to stand idle orquickly restored to the degree determined by said fine adj ustment whenoperations are to be resumed.

2. In a power-transmitting device, in combination, a supporting bracket,a hanger, a pulley supported in said hanger, a slide-rod mounted in saidbracket and connected to said hanger, a fine adjustment between saidhanger and slide-rod, and manually controlled means for sliding said rodrelatively to said supporting bracket.

3. In a power-transmitting device, in combination, a supporting bracket,a hanger, a pulley supported in said hanger, a rod formed with a spiralscrew-thread and journaled for sliding and turning movements in saidbracket, a follower connected to said hanger and engaging saidscrew-thread, and manually controlled means for effecting turning orsliding movements of said rod, each independently of the other.

4. In a power-transmitting device, in combination, a supporting bracket,a slide-rod mounted in said bracket, a hanger carried by said slide-rod,an adjustment between said hanger and slide-rod, and means for shiftingsaid slide-rod endwise relatively to said bracket.

5. In a power-transmitting device, in combination, a supporting bracket,a slide-rod mounted in said bracket, a hanger carried by said slide-rod,an adjustment between said hanger and slide-rod, and a cam-lever mountedon said slide-rod and reacting against said bracket for quicklyeffecting a relative shift of said slide-rod and bracket from oneextreme position to the other.

6. In combination, a support, a pulleyhanger, an intermediate connectionshiftable relatively to both of said parts, and unitary means foreffecting both movements.

7. In combination, a support, a pulleyhanger, an intermediate connectionshiftable relatively to both of said parts and unitary means carried bysaid connection for effecting both movements.

8. In combination, a support, a pulleyhanger, and an intermediateconnecting element slidably shiftable with respect to one of said partsand adjustable with respect to the other by rotation.

9. In combination, a support, a pulleyhanger, and an intermediateconnecting means having a shifting movement of fixed amplitude withrespect to one of said parts and adjustable with respect to the other.

10. In combination, a support, a pulleyhanger, an intermediateconnecting means having a shifting movement of fixed amplitude withrespect to one of said parts and a variable shifting movement withrespect to the other, and unitary means for effecting both movements.

11. In combination, a support, a pulleyhanger, an intermediate element,a connection between said element and one of said first-mentioned partshaving an invariable shifting movement, a connection between saidelement and the other of said parts having a variable shifting movement,said latter connection including means for fixedly connecting the two ifdesired.

12. In combinations, a su port, a pulleyhanger, a connection invaria lyand variably shiftable, respectively, with respect to said parts, andmeans movable in difierent paths for effecting said movements.

13. In combination, a support, a pulleyhanger having separate invariableand variable shifting movements with respect to said support, and meansfor effecting said. movements.

14. In a power-transmitter for machines, a driving wheel, a belt forconnecting the driving wheel to the machine, means for varying thedriving tension of the belt, means for loosening the belt when not inuse, and a unitary actuating means for both of said previously recitedmeans.

In testimony whereof I have signed my name to this specification.

ALBERT H. DE VOE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

